Median values of [Fe/H], in bins of 1.5 kpc, for the XY,XZ, and YZ planes of the Galaxy. There are regions covered by the SDSS/SEGUE sample in the XZ and YZ planes (the BOSS sample is shown in the upper row; the SDSS/SEGUE sample is shown in the lower row) that are only poorly covered by the BOSS sample, in particular at higher [Fe/H]. These stars primarily correspond to r distances between 20 and 40 kpc.